Patch for <https://nvd.nist.gov/vuln/detail?vulnId=CVE-2017-7186>
taken from <https://vcs.pcre.org/pcre2?view=revision&revision=670>.

--- trunk/src/pcre2_internal.h	2016/11/19 12:46:24	600
+++ trunk/src/pcre2_internal.h	2017/02/24 18:25:32	670
@@ -1774,10 +1774,17 @@
 /* UCD access macros */
 
 #define UCD_BLOCK_SIZE 128
-#define GET_UCD(ch) (PRIV(ucd_records) + \
+#define REAL_GET_UCD(ch) (PRIV(ucd_records) + \
         PRIV(ucd_stage2)[PRIV(ucd_stage1)[(int)(ch) / UCD_BLOCK_SIZE] * \
         UCD_BLOCK_SIZE + (int)(ch) % UCD_BLOCK_SIZE])
 
+#if PCRE2_CODE_UNIT_WIDTH == 32
+#define GET_UCD(ch) ((ch > MAX_UTF_CODE_POINT)? \
+  PRIV(dummy_ucd_record) : REAL_GET_UCD(ch))
+#else
+#define GET_UCD(ch) REAL_GET_UCD(ch)
+#endif
+
 #define UCD_CHARTYPE(ch)    GET_UCD(ch)->chartype
 #define UCD_SCRIPT(ch)      GET_UCD(ch)->script
 #define UCD_CATEGORY(ch)    PRIV(ucp_gentype)[UCD_CHARTYPE(ch)]
@@ -1834,6 +1841,9 @@
 #define _pcre2_default_compile_context PCRE2_SUFFIX(_pcre2_default_compile_context_)
 #define _pcre2_default_match_context   PCRE2_SUFFIX(_pcre2_default_match_context_)
 #define _pcre2_default_tables          PCRE2_SUFFIX(_pcre2_default_tables_)
+#if PCRE2_CODE_UNIT_WIDTH == 32
+#define _pcre2_dummy_ucd_record        PCRE2_SUFFIX(_pcre2_dummy_ucd_record_)
+#endif
 #define _pcre2_hspace_list             PCRE2_SUFFIX(_pcre2_hspace_list_)
 #define _pcre2_vspace_list             PCRE2_SUFFIX(_pcre2_vspace_list_)
 #define _pcre2_ucd_caseless_sets       PCRE2_SUFFIX(_pcre2_ucd_caseless_sets_)
@@ -1858,6 +1868,9 @@
 extern const uint32_t                  PRIV(vspace_list)[];
 extern const uint32_t                  PRIV(ucd_caseless_sets)[];
 extern const ucd_record                PRIV(ucd_records)[];
+#if PCRE2_CODE_UNIT_WIDTH == 32
+extern const ucd_record                PRIV(dummy_ucd_record)[];
+#endif
 extern const uint8_t                   PRIV(ucd_stage1)[];
 extern const uint16_t                  PRIV(ucd_stage2)[];
 extern const uint32_t                  PRIV(ucp_gbtable)[];

--- trunk/src/pcre2_ucd.c	2015/07/17 15:44:51	316
+++ trunk/src/pcre2_ucd.c	2017/02/24 18:25:32	670
@@ -41,6 +41,20 @@
 
 const char *PRIV(unicode_version) = "8.0.0";
 
+/* If the 32-bit library is run in non-32-bit mode, character values
+greater than 0x10ffff may be encountered. For these we set up a
+special record. */
+
+#if PCRE2_CODE_UNIT_WIDTH == 32
+const ucd_record PRIV(dummy_ucd_record)[] = {{
+  ucp_Common,    /* script */
+  ucp_Cn,        /* type unassigned */
+  ucp_gbOther,   /* grapheme break property */
+  0,             /* case set */
+  0,             /* other case */
+  }};
+#endif
+
 /* When recompiling tables with a new Unicode version, please check the
 types in this structure definition from pcre2_internal.h (the actual
 field names will be different):